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GCC 4.7.0 can LTO the linux kernel

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  • GCC 4.7.0 can LTO the linux kernel

    http://lwn.net/Articles/488180/
    https://github.com/andikleen/linux-misc/commits/lto

    GCC 4.7 has improved LTO and now can apparently link-time optimize the kernel. Maybe benchmark-worthy?

  • #2
    Originally posted by curaga View Post
    Maybe benchmark-worthy?
    Nope. The kernel consumes the least amount of CPU time to begin with.

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    • #3
      In some cases (like properly built http servers) there is a huge amount of work in kernelspace, in fact the more the better.

      In any case, a smaller kernel = better cache usage, measuring this would be nice too.

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      • #4
        Sys time is very hurge in desktop and server case. n some case better speed = low latency = less user space thread blocked = more performance.
        On my server, the kernel time is always at more than 25%.

        I'm very interested by benchmark and details for this.
        Developer of Ultracopier/Supercopier and of the game CatchChallenger

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